The Cap Region of M82

Credit: Tsuru et al. / ISAS/JAXA / Suzaku GOF

The "Cap" is located about 12 kpc above the disk of the starburst
galaxy, M82.
Tsuru et al. (2007) obtained a high quality Suzaku XIS spectrum
of this region, including the first clear detection of the Oxygen line.
The metal abundances of the Cap they have derived are consistent with the
Type II supernova origin. They have also detected additional diffuse
X-rays connecting the Cap to the disk of M82.